But in an already wide arena of music sites, a lot of changes are afoot. Last week, we learned about brand new online DJ site Turntable.fm (which has gained 140,000 users in its first month); one day later, Spotify, a European music-streaming service with over 10 million users, launched in North America.

We’ve tried both … and they’re both great. And so are the 20+ sites and services like them out there. To save you the time and the drudgery of visiting any music site or service that’s a shade less than excellent, we created a chart with the best of the best.

Check out our findings to see which online music sites and services are worth your time (and, possibly, your money). We judged them on a scale of one to five stars, with our top choice getting a perfect five.

Now, you can finally say good-bye to Youtube-ing your favorite songs at the office.

Rating: ****

Enter rooms to listen to other users DJ songs, or create private rooms for you and your friends

Free, but must have a Facebook friend already using the site to enter

Up to five users DJ songs from personal collections or site's library

Chat discussions

Gamer aesthetic: users have avatars and vote on songs they like

Still in beta-testing, so there are glitches

Library is sufficient, but not yet that comprehensive

Come hang out with the editorial team on Turntable.fm. Sign in to the site, and then search for the "LearnVest" listening room. Tell us which site you like most, and get to know us while we spin our favorite workday jams.

In Other News ...

Amazon gives away free mp3 downloads if you follow them on Twitter. Best feeds to follow for free stuff. Click here.
A lot has changed in over a year. Look at what our favorite picks were just last year. Read this.
Remember Limewire? Here's why it was shut down.

Got a favorite music site that we didn’t include? Let us know in the comments.

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LearnVest Planning Services is a registered investment adviser and subsidiary of LearnVest, Inc. that provides financial plans for its clients. Information shown is for illustrative purposes only and is not intended as investment advice. Please consult a financial adviser for advice specific to your financial situation. LearnVest Planning Services and any third-parties listed, discussed, identified or otherwise appearing herein are separate and unaffiliated and are not responsible for each other’s products, services or policies. LearnVest, Inc. is wholly owned by NM Planning, LLC, a subsidiary of The Northwestern Mutual Life Insurance Company.